APA (7th ed.) Citation

L'Amour, L., Rapkin, D., & Potter, C. (1986). A trail to the west. Bantam Audio Pubishing.

Chicago Style (17th ed.) Citation

L'Amour, Louis, David Rapkin, and Charles Potter. A Trail to the West. New York: Bantam Audio Pubishing, 1986.

MLA (9th ed.) Citation

L'Amour, Louis, et al. A Trail to the West. Bantam Audio Pubishing, 1986.